Forming tool



June 12, 1945. KING 2,377,888 I FORMING TOOL Filed Aug. 8, 1942 3mm 3 8- WaItEff-JTLKiJ Patented June 12, 1945 UNITED} STATES PATENT OFFICE FORMING TOOL Walter T. King, Denville, N. J.

Application August 8, 1942, Serial No. 454,196

(Granted under the act of March 3, 1883, as

amended April 30, 1928; 370 0. c.1 57) 1 Claim.

The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to a forming tool, particularly to a tool for pointing a metal stylus or the like.

It is an object of this invention to provide a tool which enables the quick and economical forming of an instrument having a predetermined contour, such as a stylus. This is achieved by cooperating members or block having cooperating grooves to receive the instrument. A cutting tool is placed in a recess of one member across the groove to engage the instrument as the latter is inserted into the bore formed by the aligned grooves of the cooperating blocks.

The specific nature of the invention as well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment as shown in the accompanying drawing in which:

Fig. l of the drawing shows the joined cooper ating blocks in elevation, with part of the holder therefor in section.

Fig. 2 shows the blocks separated, with their fiat surfaces exposed.

Fig. 3 is a view in section substantially on line 3-3 of Fig. 1.

Referring now to the figures in detail, two coperating members or blocks 2 and 4 are shown. Members 2 and 4 are preferably circular cylinders bounded by planes passing substantially through the locus of centers, as shown in Fig. 3, so that the two members form a right circular cylinder when their fiat surfaces are joined as shown, although it will of course be understood that other configurations might serve the purpose as well. Member 2 is provided with a longitudinal groove or'recess 6 which is preferably disposed substantially along the axis of the cylinder. Near one end of this groove, and disposed at an angle across it, is a second recess 8 in which a cutting tool II] is placed. Tool I0 is a blade of any suitable material having the desired configuration, and when in position in recess 8, is preferably substantially flush or even with the fiat surface of member 2. Block or member 4 is provided with a cooperating groove or recess 12 similar to roove 6. At its inner extremity, groove l2 terminates in surface l4, which may be conical or any other suitable surface depending upon the configuration to be given to the work-piece by tool "I. A second recess IS in block 4 starts at end M of groove l2 and extends laterally of the groove outward to the edge of block 4, providing an escape passage for chips removed by the cutting tool. For purposes of illustration, part of a work-piece i shown-in dotted lines at 18 in Fig. 2.

Blocks 2 and 4 may be held together by any suitable means such as cap screws 20 passing through holes 22 in block 4 and engaging threaded holes 24 in block 2. With the blocks thus tightly clamped together, cutting tool [0 is firmly held in place. To insure that tool I0 will be securely held by the clamping of the two blocks, the tool may be made slightly thicker than the depth of the recess 8 so that it projects very slightly above the fiat surface of block 2 instead of being flush with that surface. With the blocks so clamped together, grooves 6 and I2 are aligned to form a bore adapted to receive a work-piece l8 which is to be sharpened or otherwise formed or cut by tool 10-.

With the blocks clamped'to ether as described, they may be held' by a suitable holder 26 and secured against rotationrelative to the holder by a screw 28. Holder 26 will preferably be provided with a shank 36 adapted to fit a lathe chuck.

Operation.With blocks or member 2 and 4 clamped together, and held by holder 26 in alathe, the assembled forming tool may be rotated counterclockwise as seen in Fig. 3. A work-piece such as the stylus [8 may then be inserted, being held firmly against rotation, and pressed in- Ward against the rotating cutting tool 10. Alternatively, the assembled forming tool may be firmly held against rotation, and the work-piece rotated. This rotation would be clockwise in the tool assembly shown in Fig. 3.

I claim:

A tool for forming metal styluses and the like, comprising a pair of members having cooperating flat surfaces and semi-cylindrical cooperating grooves in said members, a recess in the surface of one member extending diagonally across the semicyclindrical groove in that member, a cutting tool in said recess with its cutting edge extending diagonally across said groove and its outer surface flush wit-h the surface of the recessed member, a chip exit opening in the other member and extending from its groove radially outward, and means for holding said members together with their cooperating surfaces in abutting relation and with the grooves in alignment to form a bore for the insertion of the work.

WALTER T. KING. 

